Golf ball having balance rotation line and manufacturing method therefor

ABSTRACT

A golf ball having a balance rotation line, wherein a balance rotation line is formed on an arbitrary line in which a point for marking the center of gravity of the ball is vertical to a joining line on the ball, thereby enabling accurate putting; and a manufacturing method therefor.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional of Ser. No. 14/897,170, filed Dec. 9, 2015; which is the U.S. national stage application of international Patent Application No. PCT/KR2014/008348, filed Sep. 4, 2014; which claims priority to Korean Application No. 10-2013-0117287, filed Oct. 1, 2013, the disclosures of each of which are incorporated herein by reference in their entirety.

TECHNICAL FIELD

The present invention relates to a golf ball on which a balance rotation line is formed and a method of manufacturing the same, and more particularly, a golf ball on which a balance rotation line is formed on an arbitrary line, which perpendicularly connects a marking point of the center of gravity and a joining line of the golf ball, for putting by accurate hitting so that a moving direction of the golf ball matches a direction desired by a golfer after hitting the golf ball, and a method of manufacturing the same.

BACKGROUND OF THE INVENTION

Generally, when a driver shot or iron shot is performed in golf, a posture of a player and a hitting point on a golf ball are important for improving a driving distance of the golf ball. Particularly, a portion of a golf ball spaced apart from the center of the golf ball by a predetermined distance has to be hit in a downward direction, then the golf ball reversely rotates and a lift force occurs in a direction perpendicular to a moving direction of the golf ball, and thus, the golf ball moves far away. When this principle is applied to golf, particularly, in order to send a golf ball flying far away in a desired direction, it is important to recognize that each player accurately checks the center of gravity of the golf ball to hit the golf ball.

Here, the golf ball is manufactured based on a diameter greater than 1.68 inches (42.67 mm) and a weight lighter than 1.62 ounces (45.93 g) to be used for golf. As shown in FIG. 1, generally, the golf ball includes a core 2 formed at the center thereof and a cover 3 which surrounds the core 2.

However, since mass-produced golf balls have centers of gravity different from each other and also have weights different from each other, it is very difficult to find the center of gravity of each golf ball and to set an upper point of the center of gravity as a central axis of rotation thereof.

That is, since a core of a golf ball is heavier than a cover thereof, when the core is not positioned at the center the golf ball and is biased to one side thereof, a heavy side and a light side are generated in the golf ball causing the golf ball to be an unbalanced state, and thus, movement of the golf ball has to bend in a direction of the heavy side because a weight distribution of left and right sides thereof is non-uniform when the golf ball rolls.

Accordingly, recently, a putting line has been arbitrarily marked on an outer circumferential surface of a golf ball to be used. However, the putting line causes a problem in that the golf ball is hit inaccurately due to the low accuracy of the line.

Further, as shown in FIG. 2, a joining line 30 is formed on a golf ball, and when the golf ball is rolled or sent airborne by hitting, in the case in which the left and right sides of the joining line 30 are not positioned at the same line as a line connecting both sides of the golf ball perpendicular to a rotation direction thereof, the accuracy of the hitting is low, and thus, it causes a problem in that the golf ball is inaccurately hit due to the low accuracy of the line.

DISCLOSURE

The background technology of the present invention is disclosed as Republic of Korea Patent Registration No. 10-1266061 (registered on May 14, 2013).

TECHNICAL PROBLEM

The present invention is directed to providing a golf ball on which a balance rotation line is formed so that the center of gravity of the golf ball is checked, a marking point of the center of gravity for indicating the center of gravity of the golf ball is formed on an outer surface thereof, a balance rotation line is formed on an arbitrary line which perpendicularly connects the marking point of the center of gravity thereof and a joining line thereof, and a straight directivity by rotation and a driving distance are effectively secured when hitting the golf bail, and a method of manufacturing the same.

TECHNICAL SOLUTION

One aspect of the present invention provides a golf ball having a plurality of dimples and a joining line formed on an outer circumferential surface thereof, including a marking point of the center of gravity formed and marked at a point on a surface of the golf ball to which a straight line passing through the center of the golf ball from the center of gravity thereof reaches, and a balance rotation line formed on a perpendicular line which perpendicularly connects the marking point of the center of gravity and the joining line, wherein when the marking point of the center of gravity is positioned at the joining line of the golf ball, the balance rotation line is formed perpendicular to the joining line, and when the marking point of the center of gravity is positioned at a pole of the golf ball, an arbitrary line among countless lines perpendicular to the joining line is selected to form the balance rotation line thereon.

Another aspect of the present invention provides a method of manufacturing a golf ball on which a balance rotation line is formed, including forming a marking point of the center of gravity to mark the marking point of the center of gravity at a point on a surface of the golf ball to which a straight line passing through the center of the golf ball from the center of gravity thereof reaches; identifying a joining line to identify the joining line of the golf ball on which the marking point of the center of gravity is formed; and forming a rotation line to form a balance rotation line on a perpendicular line which perpendicularly connects the marking point of the center of gravity and the joining line, wherein when the marking point of the center of gravity is positioned at the joining line of the golf ball, the balance rotation line is formed perpendicular to the joining line, and when the marking point of the center of gravity is positioned at a pole of the golf ball, an arbitrary line among countless lines perpendicular to the joining line is selected to form the balance rotation line thereon.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a view illustrating the inside of a general golf ball.

FIG. 2 is a view illustrating a joining line formed on an outer circumferential surface of the general golf ball.

FIG. 3 is a view illustrating a state of a golf ball according to an embodiment of the present invention.

FIG. 4 is a flowchart for describing a method of manufacturing the golf ball according to the embodiment of the present invention.

DESCRIPTION OF SPECIFIC EMBODIMENTS

Hereinafter, a golf ball on which a balance rotation line is formed and a method of manufacturing the same according to the present invention will be described more fully with reference to the accompanying drawings. In the description of the present invention, when it is determined that a detailed description of the related art of the present invention unnecessarily obscures the gist of the present invention, the detailed description will be omitted.

In addition, as the terms to be described below are the terms set in consideration of functions of the present invention, the terms may vary according to an intention of producers or manufacturers by which products are manufactured. In the drawings, the thicknesses of lines and sizes of components may be exaggerated with respect to actual physical thicknesses and sizes for convenience of description. Since the embodiments and drawings of the present invention are merely exemplary embodiments and do not fully cover the technical sprit of the present invention, it should be understood that the present invention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.

First, resistance generated from a fast flying golf ball includes frictional resistance generated at a front surface of the golf ball and form resistance generated at the rear thereof. The frictional resistance is resistance generated at the golf ball due to friction between air and the golf ball, and the form resistance is resistance generated by a vortex of air which is generated at the rear of the golf ball when the golf ball flies in the air.

The form resistance of the above resistances acts as a major factor for degrading the properties of a trajectory and a driving distance of the golf ball, and thus, a plurality of concave grooves, i.e., referred to as dimples 10, are formed on an outer surface of the golf ball to reduce the form resistance.

Since a flow of the air is relatively slow with respect to a golf ball having the dimples 10 when compared with a golf ball having no dimples, a vortex generated at the rear of the golf ball, i.e., a wake generation region, is reduced, and thus, form resistance, which is generated when the wake pulls the golf ball in a direction opposite a flying direction thereof, is decreased.

When dimples are arranged on a surface of the golf ball, the dimples are designed using various polyhedrons made by dividing a surface of a sphere into a plurality of circles. For example, there are many types of divided compositions of the sphere such as a spherical tetrahedron having four spherical triangles, a spherical hexahedron having six spherical quadrangles, a spherical octahedron having eight spherical triangles, a spherical dodecahedron having 12 spherical pentagons, a spherical icosahedron having 20 spherical triangles, etc.

Further, the dimples are arranged by additionally subdividing the above spherical polyhedrons to classify the surface of the sphere into a spherical 20-12 polyhedron, a spherical 6-8 polyhedron, etc. However, although all of the divided compositions are divided into different spherical polyhedrons from each other to arrange the dimples, they may eventually overlap each other in spheres having the same diameter.

Nevertheless, the reality is that a golf ball having dimples arranged by a new divided. composition is manufactured. The reason is that the size, depth, shape of each dimple may vary because the sizes of surface areas of faces of the polyhedron may vary according to the type of divided composition when the dimples are arranged on an entire surface of a sphere.

As a result, new divided compositions are continuously made because a flight characteristic varies according to arrangement of each dimple. Further, when dimples are arranged on a surface of a sphere using the above division method of the spherical polyhedron, the dimples arranged symmetrical to each other within one face of the polyhedron make an excellent flight characteristic when compared with asymmetrical arrangement thereof even in the same polyhedron.

Since the resistance of air is further uniform in a low speed region from a peak of a trajectory to the ground to which a golf ball drops while the golf ball flies, wobbling of the golf ball is reduced, and thus, the golf ball lands with a stable arcing trajectory.

Pressure drag more affects a large dimple than a small dimple in a flying region from a hitting point of the golf ball to the peak of the trajectory, i.e., a high speed region, whereas the pressure drag less affects the large dimple than a small dimple in the low speed region.

Accordingly, a new method of dividing a surface of a golf ball sphere and an arrangement of dimples on the surface of the divided sphere are important factors in order that the golf ball has a more uniform landing property and an excellent driving distance property.

Further, although an upper portion and lower portion of a golf ball have been formed identically by forming the golf ball having the dimples on an outer surface thereof by joining an upper mold and a lower mold in a process of manufacturing the golf ball, the dimples are arranged without regular criteria or rules. In addition, a setup of the rules is difficult to arrange about 500 dimples within a diameter of 42.67 mm.

Accordingly, recently, various studies on arrangement, numbers, various types of sizes, volumes, and forms have been conducted to further increase a driving distance of a golf ball and to improve the aerodynamic symmetry of the golf ball.

Further, the golf ball is manufactured by manufacturing a core and pressing half covers from directions of both sides thereof. However, when the golf ball is carefully checked, a joining line caused by joining the half covers is formed minutely.

In addition to the arrangement of the dimples for rotation of the golf ball, a uniform weight distribution of left and right sides of a golf ball based on a rotation line, and a joining line 30 positioned at the same line as a line connecting the left and right sides based on the rotation line when a golf ball rolls are very important factors.

Accordingly, an embodiment of the present invention is directed to finding the center of gravity of the golf ball, to forming a marking point of the center of gravity for indicating the center of gravity on an outer surface of the golf ball, to forming a balance rotation line 40 on an arbitrary line which perpendicularly connects the marking point of the center of gravity thereof and a joining line thereof so that a straight directivity by rotation and a driving distance are more effectively secured when hitting the golf ball.

That is, when the marking point of the center of gravity of the golf ball is positioned on the rotation line of the golf ball, after hitting the golf ball, since the center of gravity of the golf ball is in a balanced state based on the rotation line, wobbling of the golf ball is prevented while the golf ball rotates and rolls, and thus, the straight directivity by rotation and the driving distance of the golf ball can be secured.

Here, when the joining line is formed asymmetrical to the line connecting left and right sides based on the rotation line of the golf ball and the golf ball rotates and rolls by hitting, resistance alternately acts on left and right sides of the joining line based on the rotation line, and thus the wobbling of the golf ball is generated. Thus, in the embodiment of the present invention, the balance rotation line 40 is formed on an arbitrary line which perpendicularly connects the marking point of the center of gravity thereof and a joining line thereof so that the joining line is positioned symmetrical to the line connecting the left and right sides based on the rotation line, thereby preventing the wobbling of the golf ball when the golf ball straightly rolls by hitting the golf ball.

As shown in FIG. 3, a plurality of dimples and a joining line are formed on an outer circumferential surface of a golf ball 1 according to the embodiment of the present invention, and a marking point of the center of gravity 20 and a balance rotation line 40 are formed on an outer surface of the golf ball 1.

The center of gravity of the golf ball 1 is found, and the marking point of the center of gravity 20 is formed on a cover, i.e., the outer surface of the golf ball 1, to recognize the center of gravity thereof.

According to the embodiment of the present invention, in the case in which salt water having a specific gravity greater than water is used for marking the marking point of the center of gravity 20 on the surface of the golf ball, when the golf ball is put into the salt water, a part of the golf ball is exposed on a surface of the salt water, and at this time, the marking point of the center of gravity is marked at one of an exposed top point and an opposite point symmetrical to the exposed top point. Here, since it is difficult to mark the marking point of the center of gravity at a point in the salt water, the marking point of the center of gravity 20 may be marked at the exposed top point.

That is, the exposed top point where the marking point of the center of gravity 20 is marked is formed at a point of the surface of the golf ball to which a straight line passing through the center of the golf ball from the center of gravity thereof reaches.

Here, a method of finding the center of gravity of the golf ball and marking the marking point of the center of gravity on the outer surface of the golf ball is described using the salt water, but is not limited thereto.

Further, as the balance rotation line 40 is formed on an arbitrary line which perpendicularly connects the marking point of the center of gravity 20 and the joining line 30, the balance rotation line 40 is formed by a marker or printed on the outer surface of the golf ball, and thus may not be removed easily.

In other words, as the balance rotation line 40 is marked for easily recognizing a straight direction of the golf ball by a user, a weight distribution of left and right sides of the golf ball is uniformly formed based on the balance rotation line 40, and the joining line 30 is positioned at the same line as a line connecting left and rights sides based on the rotation line when a golf ball rolls, and thus, after hitting the golf ball, the straight directivity of the golf ball can be improved.

Further, even when the golf ball is sent flying far away by hitting, a driving distance may also be increased due to the improvement of the straight directivity of the golf ball.

Here, there are a case in which the marking point of the center of gravity 20 for indicating the center of gravity of the golf ball is positioned on a joining line of the golf ball and a case in which it is positioned on a pole of the golf ball. When the marking point of the center of gravity is positioned on the joining line of the golf ball, the balance rotation line 40 is formed perpendicular to the joining line 30, and when the marking point of the center of gravity is positioned on a pole of the golf ball, an arbitrary line among countless lines perpendicular to the joining line is selected to form the balance rotation line 40 thereon.

Meanwhile, as shown in FIG. 4, a method of manufacturing the golf ball according to the embodiment of the present invention includes forming a marking point of the center of gravity (S10), identifying a joining line (S20), and forming a rotation line (S30).

The forming of the marking point of the center of gravity (S10) includes forming the marking point of the center of gravity at a point on a surface of the golf ball to which a straight line passing through the center of the golf ball from the center of gravity thereof reaches. Here, before forming the marking point of the center of gravity 20 on an outer surface of the golf ball, the center of gravity of each golf ball has to be found first.

After finding the center of gravity of the golf ball and forming the marking point of the center of gravity 20 on the outer surface of the golf ball, the joining line 30 generated in a process of manufacturing the golf ball is identified.

That is, the golf ball is manufactured by manufacturing a spherical core 2 and a cover 3. The cover 3 is divided into two half covers, the half covers are pressed from directions of both sides thereof to surround the core 2, and at this time, the joining line 30, i.e., a line generated when the hemispherical covers are joined, is made.

After identifying the joining line of the golf ball, the forming of the rotation line (S30) is performed to form a balance rotation line.

That is, the balance rotation line 40 is formed on a perpendicular line perpendicularly connecting the marking point of the center of gravity and the joining line. When the marking point of the center of gravity is positioned on the joining line of the golf ball, the balance rotation line is formed perpendicular to the joining line, and when the marking point of the center of gravity is positioned on a pole of the golf ball, an arbitrary line among countless lines perpendicular to the joining line is selected to form the balance rotation line 40 thereon.

Here, since the balance rotation line 40 is formed perpendicular to the joining line 30, a moving direction of the golf ball desired by a golfer is disposed to match the balance rotation line 40 when hitting the golf ball. Thus, the golf ball rotates along the balance rotation line 40 when airborne or rolling, thereby contributing to improved driving distance and accurate putting.

The above description exemplarily describes the present invention and one skilled in the art may understand that the present invention can be variously modified without changing the essential features of the present invention. Therefore, the embodiments and accompanying drawings disclosed herein are for the purpose of describing the technical sprit of the present invention only and the scope of the technical sprit is not intended to be limited by the embodiments and accompanying drawings. The scope of the present invention should be defined by the appended claims, and all technical concepts equivalent to the foregoing should be interpreted to be included within the scope of the present invention.

INDUSTRIAL APPLICABILITY

According to the embodiment of the present invention, since a balance rotation line is formed on an arbitrary line which perpendicularly connects a marking point of the center of gravity of the golf ball and a joining line of the golf ball, a moving direction of the golf ball desired by a golfer matches the balance rotation line after hitting the golf ball, and thus, the number of slices or hooks are decreased when driver or iron shots are performed, and a straight directivity by rotation and a driving distance can also be effectively secured. 

What is claimed is:
 1. A method of manufacturing a golf ball on which a balance rotation line is formed, comprising: forming a marking point of the center of gravity to mark the marking point of the center of gravity at a point on a surface of the golf ball to which a straight line passing through the center of the golf ball from the center of gravity thereof reaches; identifying a joining line to identify the joining line of the golf ball on which the marking point of the center of gravity is formed; and forming a rotation line to form a balance rotation line on a perpendicular line which perpendicularly connects the marking point of the center of gravity and the joining line, wherein when the marking point of the center of gravity is positioned at the joining line of the golf ball, the balance rotation line is formed perpendicular to the joining line, and when the marking point of the center of gravity is positioned at a pole of the golf ball, an arbitrary line among countless lines perpendicular to the joining line is selected to form the balance rotation line thereon. 